On the capability of an up-ward-looking ADCP deployed in the Iceland-Faeroe
frontal area

H.-H. ESSEN
Deutsche Hydrographische Zeitschrift 46, pp. 211...228, 1994.
Abstract - -
An upward looking acoustic Doppler current profiler (ADCP), developed in the
Iceland-Faeroe area, recorded horizontal currents as function of depth over a
period of some 200 days from August 1991 to March 1992. The water depth at the
mooring was about 400 m and the vertical resolution 16 m. Differently from the
point measurements of conventional current meters the ADCP performs vertical
integrations within the resolution cells. This feature is used to determine the
barotropic tides. Through instrumental limitations it is expected that currents
measured in the upper 15% of the water column are contaminated by side-lobe
reflections from the sea surface. Some evidence has been found that this effect
is less important in the upper part of the contaminated layer, where currents
are significantly correlated with winds. Variance spectra of high resolution
may be obtained from the ADCP data by performing spectral averaging over depth
instead of time. This is demonstrated with respect to inertial oscillations.
The ADCP allows to study the vertical coherence over nearly continuous
spacings.
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